The people in the HTS apparently witnessed the shooting. Gabi isn't a sniper and half the town are suspects. If she is the culprit, she could have hired a hit man. I don't think we're going to find out for awhile who did it which would make sense if it is Gabi since she leaves in June.

It seems likely it would be Gabi, but it's not necessarily a definite thing. Gabi is supposed to be doing some modeling in South America soon, so maybe she ends up moving somewhere else and she and Will will split custody, like Parker does with Dr. Tan & Chloe. I am not seeing anything yet (as much as I want to) that shows Gabi is onto Nick. I'm not convinced she's behind hiring a hit man...yet.

And imo, BB is one of the best actors on the show. Assuming he's the one going down, that's a big loss for Days.